CONSOLIDATED STATEMENT OF INCOME (UNAUDITED) - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues
Interest revenue		$ 12,463	$ 14,589	$ 24,997	$ 31,728
Interest expense		2,264	3,509	4,632	9,156
Net interest revenue		10,199	11,080	20,365	22,572
Commissions and fees		3,374	2,933	7,044	5,954
Principal transactions		2,304	4,157	6,217	9,418
Administration and other fiduciary fees		1,022	819	1,983	1,673
Realized gains on sales of investments, net		137	748	538	1,180
Impairment losses on investments:
Impairment losses on investments and other assets		(13)	(69)	(82)	(124)
Provision for credit losses on AFS debt securities	[1]	0	(8)	0	(8)
Net impairment losses recognized in earnings		(13)	(77)	(82)	(132)
Other revenue (loss)		451	106	736	(168)
Total non-interest revenues		7,275	8,686	16,436	17,925
Total revenues, net of interest expense		17,474	19,766	36,801	40,497
Provisions for credit losses and for benefits and claims
Provision for credit losses on loans		(1,126)	7,990	(2,605)	14,367
Provision for credit losses on held-to-maturity (HTM) debt securities		4	31	(7)	37
Provision for credit losses on other assets		(3)	48	6	44
Policyholder benefits and claims		15	15	67	39
Provision for credit losses on unfunded lending commitments		44	113	(582)	670
Total provisions for credit losses and for benefits and claims	[2]	(1,066)	8,197	(3,121)	15,157
Operating expenses
Compensation and benefits		5,982	5,624	11,983	11,278
Premises and equipment		558	562	1,134	1,127
Technology/communication		1,895	1,741	3,747	3,464
Advertising and marketing		340	299	610	627
Other operating		2,417	2,234	4,791	4,607
Total operating expenses		11,192	10,460	22,265	21,103
Income (loss) from continuing operations before income taxes		7,348	1,109	17,657	4,237
Provision for income taxes		1,155	52	3,487	632
Income (loss) from continuing operations		6,193	1,057	14,170	3,605
Discontinued operations
Income (loss) from discontinued operations		10	(1)	8	(19)
Benefit for income taxes		0	0	0	0
Income (loss) from discontinued operations, net of taxes		10	(1)	8	(19)
Net income (loss) before attribution of noncontrolling interests		6,203	1,056	14,178	3,586
Noncontrolling interests		10	0	43	(6)
Citigroup’s net income		$ 6,193	$ 1,056	$ 14,135	$ 3,592
Basic earnings per share
Income from continuing operations (in dollars per share)	[3]	$ 2.86	$ 0.38	$ 6.51	$ 1.45
Income from discontinued operations, net of taxes (in dollars per share)	[3]	0	0	0	(0.01)
Net income (in dollars per share)	[3]	$ 2.87	$ 0.38	$ 6.52	$ 1.44
Weighted average common shares outstanding (in shares)		2,056.5	2,081.7	2,069.3	2,089.8
Diluted earnings per share
Income from continuing operations (in dollars per share)	[3]	$ 2.84	$ 0.38	$ 6.47	$ 1.45
Income (loss) from discontinued operations, net of taxes (in dollars per share)	[3]	0	0	0	(0.01)
Net income (in dollars per share)	[3]	$ 2.85	$ 0.38	$ 6.47	$ 1.44
Adjusted weighted average common shares outstanding (in shares)		2,073.0	2,084.3	2,084.8	2,103.0

[1] In accordance with ASC 326.

[2] This total excludes the provision for credit losses on AFS securities, which is disclosed separately above.

[3] Due to rounding, earnings per share on continuing operations and discontinued operations may not sum to earnings per share on net income.